One heck of a box...

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One heck of a box...

Postby foxyangel22 » Tue Apr 04, 2006 9:29 pm

A packing box of 2.2m x 4.9m x 5.5m is to be completely covered with a plywood. how many square meters of plywood are needed?

Help me please.... Thanks... :cry:

Postby shill » Sun Apr 16, 2006 1:53 am

The formula for surface area of a rectangular prism is 2ab + 2bc + 2ac.
2ab = 2(2.2m)(4.9m) = 21.56m²
2bc = 2(4.9m)(5.5m) = 53.9m²
2ac = 2(2.2m)(5.5m) = 24.2m²

2ab+2bc+2ac = 99.66m²
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